81548858 has 8 divisors (see below), whose sum is σ = 122384640. Its totient is φ = 40753980.

The previous prime is 81548843. The next prime is 81548867. The reversal of 81548858 is 85884518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81548858² = 13300432482208328, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4628 + ... + 13583.

It is an arithmetic number, because the mean of its divisors is an integer number (15298080).

Almost surely, 2^81548858 is an apocalyptic number.

81548858 is a deficient number, since it is larger than the sum of its proper divisors (40835782).

81548858 is a wasteful number, since it uses less digits than its factorization.

81548858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20452.

The product of its digits is 409600, while the sum is 47.

The square root of 81548858 is about 9030.4406315528. The cubic root of 81548858 is about 433.6499438948.

The spelling of 81548858 in words is "eighty-one million, five hundred forty-eight thousand, eight hundred fifty-eight".